Hydraulic gear-jack



UNITED sra'rEs ALBERT W. HILLIARD, OF WHEELERSBURG, OHIO.

HYDRAULIC GEAR-JACK.

Specication of Letters Patent. Patented June 22, 1920.

Application filed October 18, 1919. Serial No. 331,643.

To all whom 'it may concern.'

Be it known that I, ALBERT W. HIILIARD, a citizen of the United States,and a resident of Wheelersburg, in the county of Scioto and State ofOhio, have invented a new and ImprovedA Hydraulic Gear Jack, of whichthe 'following is a full, clear, and eX- act description.

This invention relates to improvements in hydraulic gear jacks, anobject ofthe invention being to provide an improved construction andarrangement of hydraulic jack adapted to strip or remove a' gear,pinion, cam, collar, commutator core, or various other devices from theshaft carrying the same.

A further object is to provide improved adjustable means for engagingand holding the gear or other device against longitudinal movement andprovide improved hydraulic means for moving the shaft longitudinally toremove the gear from the shaft.

WithI these and other objects in view the .invention consists in certainnovel features of construction, and combinations and ar-l rangements ofparts, as will be more fully pointed out in section, but partly inelevation, the section being on the line-1 1 of Fig. 2;

Fig. 2 is a view mainly in elevation, but partly in section on the line2-A-2 of Fig. l;

Fig. 3 is a view in vertical transverse sec# tion on the line 3-3 ofFig. 2; and

Fig. 4 is an enlarged fragmentary vview in longitudinal sectionillustrating one of the check valves. i

1 represents a cylindrical casing havin longitudinal integral webs 2 atits sides an a frame 3 at one end. This frame 3 may be a separate member'Xed to the casing or may be integral therewith as desired, and at itsends. supports removable plates 4.

These plates 4 provide rotary mounting for,

. adjusting screws 5 which are located inhoritheir inner ends areprovided with internally Screw threaded sleeves 10 receiving the screws5 and caused to move toward or away from each other as the screws areturned. These jaws 9 at their free ends are made with inwardlyprojecting lingers 11 adapted to operate as shoulders and receive the.pressure of a gear wheel 12 thereagainst, the lingers being spacedapart to accommodate the shaft 13.

While I refer to the part to be removed as a gear 12, it is, of course,to be understood that any part which may be removed from the shaft by.longitudinal movement is to be included as my invention is not limitedto the removal or stripping of gears.

A casing 1 is provided with a removable head 14 at its'outer end and aplunger 15 is movable in the casing and made leak-proof by means of anysuitable lpacking ring or cup 16.A A plunger rod 17 is iiXed to theplunger 15 and is movable through the end of the casing 1 and adapted tobear against the shaft 13.

A coiled spring 18 is located in the casingv `1 at one side of theplunger 15 and exerts a pressure on the plunger tending to move the sametoward the'head 14. A by-pass pipe 19 connects the respective ends ofthe casingvand a gate valve 20, or other desired form of manuallyoperatedvalve, 1s provided inthe .by-pass pipe 19.

21 represents a pump casing which may be integral with the webs 2 abovereferred to, and provided with a pump plunger 21 operated by a handlever 22'. This lever 22 1s pivotally connected at one end by means of alink 23 with a lug 24 on onerof the webs 2 and between its ends is'pivotally .connected to the pump plunger 21', as

shown at 25. Pipes V26 and 27 connect the Y sides of the pump casing 21with the respec `tive`end`s of casing l and in these pipes 2G and 27Yspring pressed check valves 28 are located which permit a passagethrough the pipes in one direction only which is from the forward end ofthe casing to the rear end of the casing.

An air compression dome 29 is located on the upper portion of the casingl near one end and Said casing and pipes above referred to are full ofliquid 30 preferably a light oil, although, of course, the invention isnot limited to the particular liquid employed. A

suitable space is left in the dome 29 for the accumulation of air togive the necessary cushioned flexibility to the operation and to allowthe pressure to be as high as desired.

`With the parts as shown in F ig. 1, the operation is as follows: lVhenthe pump plunger 21 is reciproeated, the liquid 30 in advance of theplunger 15 is sucked into the pump easing 21 and then forced through thepipe 27 back into the casing l in rear of the plunger 15. This movementofthe liquid from one end of the casing to the other forces the plunger15 longitudinally and as the gear wheel 12 is held against longitudinalmovement in that direction, the shaft 13 is forced out of the gear.During this movement of the plunger 15, the spring 18 is compressed andwhen the operation is ended, it is simply vnecessary to open the valve2() when the spring 18 will force the plunger to the rear and the liquidwill by-pass through the pipe 19, as will be readily understood. Thevalve 20 will then be closed and the device will be ready to repeat theoperation. As above stated, the jaws 9 can be adjusted to accommodatevarying sizes of gear wheels or other devices to be removed from theshafts, and hence a wide latitude of operation is permissible.

Various slight changes may be made in the general form and arrangementof parts described without departing from the invention, and hence I don'ot limit myself to the precise details set forth but consider myselfat liberty to make such changes and alterations as fairly fall withinthe spirit and scope of the appended claims.

I claim:

1. An' apparatus of the character stated, comprising a casing, a pair ofjaws at one end of the casing, a plunger in the casing, a plunger rodprojecting through the casing and between the jaws, elastic meansholding the plunger normally adjacent one end of the cylinder, and meansfor forcing fluid from oneend of the cylinder to the other to move theplunger against the action of the elastic means. f

2. An apparatus of the character stated, comprising a casing, laterallyadjustable jaws at one end of the easing, a plunger in the casing, aplunger rod projecting through the casing and between the jaws, a springLear-,elo

interposed between the plunger and one end of the casing, and means forforcing fluid from one end of the casing to the other.

3. An apparatus of the character stated, comprising a casing, laterallyadjustable jaws at one end of the casing, a plunger in the casing, aplunger rod projecting through the casing and between the jaws, a springinterposed between the plunger and one end of the casing, a pump, pipesconnecting the pump with opposite ends of the casing, check valves insaid pipes permitting a flow in one direction only, and said casing andpipes normally lilled with liquid.

4. An apparatus of the characterv stated, comprising a casing, laterallyadjustable jaws at one end of the casing, a plunger in the casing, aplunger rod projecting through the casing and between the jaws, a springinterposed between the plunger and one end of the casing, a by-pass pipeconnecting the ends of the casing, a manually operated valve in theby-pass pipe, a pump, pipes connecting the pump with the respective endsof the casing, check valves in said last-mentioned pipes, and saideasing and pipes normally lled with liquid. i

5. An `apparatus of thc character stated. comprising a casing containingliquid, a plunger in the casing, a plunger rod projecting through oneend of the casing, a spring around the plunger rod exerting pressure onthe plunger tending to move it toward one end of the casing, means forforcing liquid from one end of the casing to the other, a by-pass pipeconnecting the ends of the casing, a valve in the by-pass pipe, and anair dome on said casing.

6. An apparatus of the character stated, comprising a casing, a framesecured at the end of the casing, alined screws mounted to turn in theframe and held against longitudinal movement. jaws having screw threadedsleeves receiving the screws. inwardly projecting fingers at the freeends ofthe jaws, a plunger in the casing, a plunger rod projectingthrough the casing and between the jaws,'and means for forcingtiuid fromone end of the casing to the other.

ALBERT XV. HILLIARD.

